Não é possível SSH após redefinir o firewall no VPS

Question

Não é possível SSH após redefinir o firewall no VPS

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Estou tendo problemas para tentar SSH para meu Debian 5 VPS com blacknight.

Estava funcionando bem até que fiz o seguinte: Conectado ao 'Parallels Infrastructure Manager' - > Recipiente - > Firewall - > Defina como 'Configurações normais do firewall'. Ele me disse que havia um erro com o IPTables e ofereceu a opção novamente com uma caixa de seleção para 'redefinir' configurações de firewall, eu selecionei isso.

Eu posso ver que as regras padrão foram aplicadas (qualquer coisa de qualquer pessoa em qualquer porta e permitindo que qualquer coisa aconteça).

Sempre que tento SSH, recebo as seguintes informações de depuração:

thomas@localmachine:~/.ssh$ ssh -v thomas@hostname
OpenSSH_5.8p1 Debian-7ubuntu1, OpenSSL 1.0.0e 6 Sep 2011
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to hostname [***********] port 22.
debug1: Connection established.
debug1: identity file /home/thomas/.ssh/id_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-4096
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-4096
debug1: identity file /home/thomas/.ssh/id_rsa-cert type -1
debug1: identity file /home/thomas/.ssh/id_dsa type -1
debug1: identity file /home/thomas/.ssh/id_dsa-cert type -1
debug1: identity file /home/thomas/.ssh/id_ecdsa type -1
debug1: identity file /home/thomas/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-5
debug1: match: OpenSSH_5.1p1 Debian-5 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.8p1 Debian-7ubuntu1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: RSA *************************************
debug1: Host 'hostname' is known and matches the RSA host key.
debug1: Found key in /home/thomas/.ssh/known_hosts:2
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/thomas/.ssh/id_rsa
debug1: Authentications that can continue: publickey
debug1: Trying private key: /home/thomas/.ssh/id_dsa
debug1: Trying private key: /home/thomas/.ssh/id_ecdsa
debug1: No more authentication methods to try.
Permission denied (publickey).

Eu tive minhas chaves RSA pública / privada configuradas e funcionando bem antes de redefinir as configurações do firewall. Eu também fiz as seguintes alterações no meu arquivo / etc / ssh / sshd_config no VPS:

PermitRootLogin no
PasswordAuthentication no
X11Forwarding no
UsePAM no
UseDNS no
AllowUsers thomas

Poderia ser algo relacionado ao servidor SSH & cliente com diferentes versões entre minha máquina local e VPS?

Qualquer ajuda apreciada.

Saída com ssh -vvv

thomas@localcomputer:~/.ssh$ ssh -vvv thomas@****************
OpenSSH_5.8p1 Debian-7ubuntu1, OpenSSL 1.0.0e 6 Sep 2011
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to ************ [*************] port 22.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/thomas/.ssh/id_rsa" as a RSA1 public key
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug2: key_type_from_name: unknown key type 'Proc-Type:'
debug3: key_read: missing keytype
debug2: key_type_from_name: unknown key type 'DEK-Info:'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /home/thomas/.ssh/id_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-4096
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-4096
debug1: identity file /home/thomas/.ssh/id_rsa-cert type -1
debug1: identity file /home/thomas/.ssh/id_dsa type -1
debug1: identity file /home/thomas/.ssh/id_dsa-cert type -1
debug1: identity file /home/thomas/.ssh/id_ecdsa type -1
debug1: identity file /home/thomas/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-5
debug1: match: OpenSSH_5.1p1 Debian-5 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.8p1 Debian-7ubuntu1
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "*****************" from file "/home/thomas/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /home/thomas/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],ssh-rsa
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: [email protected],[email protected],ssh-rsa,[email protected],[email protected],[email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[email protected],zlib
debug2: kex_parse_kexinit: none,[email protected],zlib
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,[email protected],aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,[email protected],aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[email protected]
debug2: kex_parse_kexinit: none,[email protected]
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: mac_setup: found hmac-md5
debug1: kex: server->client aes128-ctr hmac-md5 none
debug2: mac_setup: found hmac-md5
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 127/256
debug2: bits set: 498/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: RSA ***********************************************************
debug3: load_hostkeys: loading entries for host "*********************" from file "/home/thomas/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /home/thomas/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug1: Host '****************' is known and matches the RSA host key.
debug1: Found key in /home/thomas/.ssh/known_hosts:1
debug2: bits set: 516/1024
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/thomas/.ssh/id_rsa (0x7fa7028b6010)
debug2: key: /home/thomas/.ssh/id_dsa ((nil))
debug2: key: /home/thomas/.ssh/id_ecdsa ((nil))
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/thomas/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey
debug1: Trying private key: /home/thomas/.ssh/id_dsa
debug3: no such identity: /home/thomas/.ssh/id_dsa
debug1: Trying private key: /home/thomas/.ssh/id_ecdsa
debug3: no such identity: /home/thomas/.ssh/id_ecdsa
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
Permission denied (publickey).

sshd_config

# Package generated configuration file
# See the sshd(8) manpage for details

# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 768

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication:
LoginGraceTime 120
PermitRootLogin no
StrictModes yes

RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile %h/.ssh/authorized_keys

# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes

# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no

# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
C    hallengeResponseAuthentication no

# Change to no to disable tunnelled clear text passwords
PasswordAuthentication no

# Kerberos options
#KerberosAuthentication no
#KerberosGetAFSToken no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

X11Forwarding no
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no

#MaxStartups 10:30:60
#Banner /etc/issue.net

# Allow client to pass locale environment variables
AcceptEnv LANG LC_*

Subsystem sftp /usr/lib/openssh/sftp-server

UsePAM no
UseDNS no

AllowUsers thomas

Obrigado

ssh vps ssh-keys

por Thomas Buckley 31.12.2011 / 18:23

2 respostas

Tags ssh vps ssh-keys

Configurando um servidor BITS somente para upload Execute ações do iproute2 com base em um critério de correspondência

score 1 · Answer 1

Olhando para a sua saída de depuração, parece que você está usando um gerador de chaves PuTTY para o seu par de chaves pública / privada. PuTTYkeygen.exe não gera chaves da mesma maneira que o openSSH as lê e não é compatível com authorized_keys.

Porque começa com debug2: key_type_from_name: unknown key type '-----BEGIN' e termina com debug2: key_type_from_name: unknown key type '-----END' o servidor não consegue ler a chave e a autenticação falha. Não sei se esse é o problema original ou se você o introduziu ao tentar consertar as coisas, mas precisará ser corrigido antes de continuar.
Você pode ver o formato de arquivo no link

A resposta curta é:
* Nenhuma quebra de linha
* Começa com o protocolo (ssh-rsa, ssh-dsa)
* Chave pública
* Termina com "=" e o nome da chave

score 0 · Answer 2

ATUALIZADO:

debug3: Could not load "/home/thomas/.ssh/id_rsa" as a RSA1 public key

Aponta para um problema com a chave no lado do cliente. O outro texto de erro parece indicar um problema de formatação.

Eu tentaria ver se os arquivos de chave foram alterados recentemente (comparando com backups) ou regenerando as chaves.

Resposta original mais burra:)

Então, aqui está meu log de depuração quando um logon de chave pública é bem-sucedido:

debug2: we sent a publickey packet, wait for reply

debug3: Wrote 528 bytes for a total of 1637

debug1: Server accepts key: pkalg ssh-dss blen 434

debug2: input_userauth_pk_ok: SHA1 (redacted)

debug3: sign_and_send_pubkey

debug3: Wrote 576 bytes for a total of 2213

debug1: Authentication succeeded (publickey).

Se você comparar isso com seu registro, parece que sua chave é inválida ou está sendo rejeitada.

A razão mais comum para isso na minha experiência é problemas com permissão nos diretórios home ou .ssh, ou no seu arquivo authorized_keys (no lado do servidor). Nenhum deles deve ser grupo - quanto mais mundo - gravável.

A verificação dos registros no servidor também deve revelar dados de depuração úteis.

aplausos!